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ASHRAE STD 62.1

Ventilation for Acceptable Indoor Air Quality

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Organization: ASHRAE
Publication Date: 27 January 2021
Status: active
Page Count: 5
scope:

FOREWORD

Addendum a clarifies that air density adjustments are permitted but are not required. At the publication of ANSI/ASHRAE Standard 62.1-2016, General Notes for Table 6.2.2.1, Note 3 was modified from "Air density: Volumetric airflow rates are based on dry air density of 0.075 lbda/ft3 (1.2 kgda/m3) at a barometric pressure of 1 atm (101.3 kPa) and an air temperature of 70°F (21°C). Rates may be adjusted for actual density, but such adjustment is not required for compliance with this standard." to read "Air density: Volumetric airflow rates are based on dry air density of 0.075 lbda/ft3 (1.2 kgda/m3) at a barometric pressure of 1 atm (101.3 kPa) and an air temperature of 70°F (21°C). Rates shall be permitted to be adjusted for actual density." This change was undertaken as editorial in order to conform the standard to standard language requirements but has led to confusion as to whether density adjustments are required. Although the technical basis for ventilation in this standard is rooted in mass balance, the customary means of measuring airflow rates is volumetric. A requirement for density corrections would represent a substantive change and would have implications for other requirements in the standard.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.

Document History

June 25, 2023
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
June 24, 2023
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
June 24, 2023
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
February 4, 2023
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
February 4, 2023
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
February 4, 2023
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
December 5, 2022
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
November 15, 2022
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
September 30, 2022
Ventilation and Acceptable Indoor Air Quality
FOREWORD Mold and microbial growth in buildings has been a persistent problem and health concern in all parts of the world. In 2019, the ASHRAE Board of Directors approved a major change to ASHRAE...
September 30, 2022
Ventilation and Acceptable Indoor Air Quality
FOREWORD The Indoor Air Quality Procedure (IAQP) requires that a mass balance calculation be performed. Any mass balance that includes filtration or air cleaning requires a particle filtration...
September 30, 2022
Ventilation and Acceptable Indoor Air Quality
FOREWORD Health care facilities often have a mixture of spaces within the scope of both Standard 170 and Standard 62.1. Section 6.2.4.1.3 created a conflict with ASHRAE/ASHE Standard 170, as it...
September 23, 2022
Ventilation and Acceptable Indoor Air Quality
FOREWORD The exhaust procedure in Standard 62.1-2022 contains requirements in notes. This addendum relocates those requirements to the body of the standard. The performance compliance path is...
January 1, 2022
Ventilation and Acceptable Indoor Air Quality
This standard applies to spaces intended for human occupancy within buildings except those within dwelling units in residential occupancies in which occupants are nontransient. This standard defines...
October 19, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD The Indoor Air Quality Procedure (IAQP) has a long history going back to the 1981 standard. It has flexibility. For design, it requires the following (simplified version): 1. Identifying...
September 30, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD Residential occupancies that are four (4) stories or more were removed from Standard 62.1 with the 2016 version. Some spaces within these buildings, such as common corridors, lobbies, etc.,...
June 30, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD The language of Section 5.10, “Maximum Indoor Air Dew Point in Mechanically Cooled Buildings,” has been interpreted by users to mean that the standard requires humidity sensors in every...
June 24, 2021
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
June 15, 2021
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
ASHRAE STD 62.1
January 27, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum a clarifies that air density adjustments are permitted but are not required. At the publication of ANSI/ASHRAE Standard 62.1-2016, General Notes for Table 6.2.2.1, Note 3 was...
January 19, 2021
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
December 1, 2020
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
November 19, 2020
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
November 19, 2020
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
October 30, 2020
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum d clarifies that open-circuit cooling towers, closed-circuit cooling towers, and evaporative condensers are all covered by the minimum separation distance requirements. Note: In...
October 30, 2020
Ventilation for Acceptable Indoor Air Quality
FOREWORD Unresolved objectors to Standard 62.1-2016 Addendum s noted that the definition for “unusual source” is unclear in distinguishing whether “rarely” refers to a source that is intermittent or...
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